Bug 2554115

Summary: CVE-2026-111125 cfitsio: cfitsio: Denial of Service via heap-based out-of-bounds read in HCOMPRESS tile decoder [fedora-all]
Product: [Fedora] Fedora Reporter: Marian Rehak <mrehak>
Component: cfitsioAssignee: Sergio Pascual <sergio.pasra>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: medium    
Version: rawhideCC: astro-sig, development.group, orion, sergio.pasra
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["3b4eb381-3f40-4e34-9b9d-7b4a36579536"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 2553694    

Description Marian Rehak 2026-10-16 13:44:59 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

CFITSIO through 4.7.0 contains a heap-based out-of-bounds read vulnerability in the HCOMPRESS tile decoder that allows attackers to read past the compressed tile buffer via input_nnybble in fits_hdecompress.c. Attackers can supply a crafted FITS file with ZCMPTYPE HCOMPRESS_1 declaring oversized tile geometry to crash applications calling fits_read_pix or disclose limited heap memory.